Static Contact Resistance - AIS
The static contact resistance or micro-ohm measurement belongs to the most important tests on circuit breakers. The test verifies whether the resistance of the current carrying contacts allows the flow of rated current within specified losses. The resistance depends on contact surface properties which are the connection points on micro-scopic level, the contact pressure and the oxidation of the surface. A temperature increase above the specified limits changes the electrical contact surface properties which then leads to an increase of losses. This self-accelerated process can develop constantly over years until it accelerated dramatically at the end. Typical resistances values are between 10 to 100 μΩ.
Expert recommends
CIBANO 500
CIBANO 500 outputs up to 200 A DC for static contact resistance measurements with very high accuracy with a digital μΩ meter.
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All important tests on breakers
Powerful integrated supply
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Other solutions
COMPANO 100
The multifunctional COMPANO 100 provides up to 100 A DC to measure static contact resistance.
Other solutions
CPX 200
CPX 200 performs highly accurate static contact resistance measurements for circuit breakers up to 1000 A DC. It’s designed for extended output cycles, ensuring that current transformers are properly saturated. When working in tight spaces, the high-current cable and clamp can be separated, enabling the cable to be mounted directly to suitable access connectors.
CPXpert allows for phase-by-phase or interrupter-by-interrupter comparisons within each phase.
